Control Strategy of Hybrid Energy Storage for Photovolatic Microgrid Applying Feedforward Active Disturbance Rejection

doi:10.12204/j.issn.1000-7229.2021.09.010

Abstract

Abstract:

Aiming at the problems of poor efficiency and weak anti-interference ability of energy-storage devices in the hybrid energy storage system of photovoltaic microgrid, this paper proposes an energy storage control strategy for hybrid photovoltaic microgrid applying the technology of feedforward linear active disturbance rejection control (FF-LADRC). Firstly, a bi-directional DC-DC mathematical model of the battery and super capacitor in the hybrid energy storage system is built. By introducing feedforward active disturbance control in the voltage loop control, the dynamic response speed and anti-jamming performance of the hybrid energy storage system are improved. A low-pass filter is set up to achieve power frequency division between different energy storage devices. At the same time, linear active disturbance rejection control is introduced into battery current loop and super capacitor current loop control to achieve coordinated control between different energy storage devices, thereby improving the power stability of the grid-connected side. The results of frequency domain analysis prove the effectiveness and stability of the proposed control strategy. The simulation results show that the proposed control strategy can quickly perform power frequency division distribution and coordinate the effective operation of the photovoltaic microgrid.

Key words: feedforward linear active disturbance rejection control (FF-LADRC), photovoltaic microgrid, bi-directional DC-DC converter, hybrid energy storage system, low-pass filtering

CLC Number:

TM712

LIU Zhijian, LI Xiaolei, LIANG Ning, ZHENG Feng, WU Yangjin, ZHANG Tingting. Control Strategy of Hybrid Energy Storage for Photovolatic Microgrid Applying Feedforward Active Disturbance Rejection[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(9): 96-104.

Figures/Tables 10

Fig.1 Overall structure of a hybrid energy-storage control strategy

Fig.2 Feedforward of the voltage loop control structure of active disturbance rejection

Fig.3 Current loop control structure of linear active disturbance rejection battery

Fig.4 Current loop control structure of linear active disturbance rejection supercapacitor

Fig.5 Frequency domain characteristic curve under ω0-ba change

Fig.6 Frequency domain characteristic curve under ω1-ba change

Fig.7 Frequency domain characteristic curve under b0-ba change

Fig.8 Structure of hybrid energy storage system in photovoltaic microgrid

Fig.9 System response under load step change

Fig.10 Response of energy storage devices under changes in photovoltaic output

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